Sewed double side seam bag



3 Sheets-Sheet l W50 f6. I

H. A. ROHDIN SEWED DOUBLE SIDE SEAM BAG Filed Dec. v, 1942 a m- :g 2a III I 1 a 17 g so I c lV28 I I I i I I I I I l ig@ -Ilif 1IIL 2 l f l I'LL [I- 7'4 l I l I I -Howardf/leoug i @www /llg June 19, 1945v H. A.RoHDlN SEWED DOUBLE SIDE SEAM BAG Filed Dec. 7, 1942 Y 3 Sheets-Sheet 2June l9, 1945. H, A, RoHDlN SEWED DOUBLE SIDE SEAM BAG Filed' Dec. 7,1942 3 Smets-sheet s Patented June 19, 1945 UNITED STATES PATENT GFFICEl1 Claims.

This invention represents primarily an improvement upon my application,Ser. No. 455,483, filed August 20, 1942, and it is an object of thepresent invention to adapt the bag disclosed in the aforesaidapplication to fabrication from multi-wall paper structures, using sewedseams and closures instead of heat sealing or adhesive seams andclosures.

It is a further object of this invention to provide in a bag having atuck in type top or bottom certain means for facilitating the openingthereof.

The above and other objects will be made clear from the followingdescription taken in connection with the annexed drawings in which:

Fig. 1 is a plan view showing the formation of a tube and the strikingifof suitable bag blank therefrom;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 2-a isI a section on the line 2-a-2-a of Fig. 1;

Fig. 3 shows the bag blank with sewed side seams applied;

Fig. 4 shows the completed bag in flattened condition;

Fig. 5 shows the bag distended and ready for filling `when a rectangularcross section is desired for the body of the bag;

Fig. 5-a is a view similar to Fig. 5 but illustrates the distribution ofthe parts when a substantially circular cross section is desired;

Fig. 6 is a fragmentary perspective view illustrating-one form ofclosure for the bag of Figs. 5 and 5a; p

Fig. 6-a is a fragmentary perspective vview showing an alternative formof closure;

Fig. 7 is a plan view of a tuck inbottom bag of the double side seamtype showing my improved opening means applled thereto;

Fig. 8 is a cross section on the line 8-8 of Fig. 7;

Fig. 9 yis a cross section on the line 9 -9 of v Fig. '1;

Fig. 9-a is a view similar to Fig. 9 butillustrating the bag indistended condition; and

Fig. 10 is a section on the line I0-I0' of Fig. 7.

The inventions disclosed herein, while entirely applicable tosingle-wall bags, have particular applicability to multi-wallstructures. For the purpose of simplicity of illustration. however, Ihave shown single -wall structures throughout this disclosure. It isunderstood that in practice the actual bag structures, particularlythose illustrated in Figs. 1 through 6-a, inclusive, will usuallycomprise from two to six and sometimes even more plies. Again forsimplicity of illustration I have shown my improved bottom opening meansas applied to a single end structure. Obviously, however, it is equallyapplicable to the double end structure shown in Figs. 1 through 6-a,inclusive,

y, and I do not intend to be limited to the application of the device ofFigs. '7 through 10 to single end bags.

Referring now to Figs. 1 and 2, I form a continuous gusseted tube I0having a lower gusset I2 and an upper gusset which comprises an innerfold I 4, an outer fold IG and in which edges I 8 and 2I'I projectlaterally beyond the outer fold I 6, with the innermost edge I8preferably, though not necessarily, projecting slightly beyond the outeredge 20. 'Suitable bag blanks 22 are severed from the continuous tubeand the side edges 24 and 26 of each blank are closed by sewing seams 28and 30 which pass through the gusset folds I2 and I4.

The edges Iii and 20 are then similarly sewed together by seams 32 and34 extending inwardly from the seams 23 and 30 and leaving a mouthportion 38 between them.

Figs. 5 and 5-a show the bag expanded and ready for lling. The body ofthe bag may assume either the rectangular configuration of Fig. 5 or thesubstantially circular configuration of Fig. 5a. Bags of this type areparticularly useful in the packaging of material such as rosin orasphalt, whichis poured into the bag in molten condition and thenpermitted to solidify. When the weight involved is only to 150# therectangular configuration is desirableand the depth of the gussets I2and I4 would, therefore, be somewhat less relative to the width of thebag between the side seams 22 and 24. Where, however, 300# or more mustbe packaged it is desirable that the stevedores should be able to rollthe package in the same manner in which they han' die a barrel or keg.For this purpose, therefore, the depth of gussets I2 and I4 ismaterially increased so that the width of each gusset when expandedapproximates the distance between the inner folds I2 and I4 when the bagis in flattened condition. 'I'he result favors the formation of theroughly rectangular cross section of Fig. 5. As shown below,-Figs. 5 and5-a, the projection of the edge I8 beyond the edge 2li facilitatesexpanding of the filling opening 36. This is an important matter wheneach of the edges I8 and 2l comprises five or six plies of paper, sinceotherwise it would be diiiicult to locate the true opening.

The relationship between gusset depth and the width of the bag (widthbeing the center distance between side seams) is one which must bethoroughly mastered for a complete understanding of this invention. Thenthe gusset folds expand to form a wall lying in a plane at right anglesto the bag length; the side seams are drawn toward each other. Thedistance they are drawn is a mathematical function of the depth of thegusset fold. Each side seam moves inwardly a distance equal to the depthof the gusset fold. As a result, the width of the expanded bag alwaysequals the width of the flat bag diminished by twice the depth of thegusset. Since the width of the expanded gusset wall always equals twicethe depth of the gusset fold, an approximately square (or cylindrical)cross section will be secured when. i-.e depth of the gusset isone-fourth the width of the bag between the side seams. As the depth ofthe gusset decreases below one-fourth the distance between seams, thecross section assumes more and more the form of an elongated rectangle.The same result would follow, in the opposite direction, by increasingthe gusset depth to more than one-fourth the distance between seams, butthis is rarely resorted to since the difiiculty of expanding the gussetsincreases with the depth of gusset.

The bag is filled through the opening 35 which is then collapsed and theedges I8 and 20 are stapled together as indicated at 40 in Fig. 6. Ifdesired, as shown in Fig. G-a, a supplementary strip of sealing tape 42may be applied over the filling opening and the tape, together with thebag mouth edges, may be stapled as indicated at 44.

Stapling this type of closure is favored because it can be accomplishedthrough the use of a small hand-operated stapling device representing aminimum equipment cost. Obviously, however, if desired, whenever suchfacilities are already available, it is entirely proper to close theopening by a supplementary sewing operation. When the final closure isto be made by sewing, it may be desirable to omit the partial closures32 and 34, or, at -any rate, to limit the length of these to theportions extending along the end walls in Fig. 5.

If for any reason it is desired to have the filling opening 36 projectsubstantially above the plane of the upper gusset fold, the rimloccasioned thereby may be folded against the body of the bag and, ifdesired, secured in such position by means of adhesive or tape or anyother suitable means. Usually, however, the rim containing the fillingopening will not project above the plane of the expanded upper gusset bymore than the depth of the seams 32 and 34. Experience has longdemonstrated that the projection of the fins occasioned by such seamsdoes not adversely affect any of the handling or strengthcharacteristics of sewed bags. Obviously, any form of seam having therequisite strength may be used. I have illustrated generally the type inwhich the seam is sewed through a reinforcing tape but it is notnecessary to utilize this type since others will sufhce and the preciseform of seam is immaterial to this invention.

Referring now to Figs. 7 through 10, inclusive, I show a bag 60 having atuck in" bottom 62 and side seams 64 and 66. The tuck in" bottom. 62forms, in eiect, a gusset and preferably, though not indispensably, Isecure the opposed inner surfaces of the gusset folds 68 and 7 10together in the area bounded by the lower corners of the bag and bylines at each corner running at 45 to the fold 62 and intersecting saidfold at the point of its intersection with the side edges. It isimportant in this connection to observe that where this securement isresorted to the gusset folds 68 and 10 are not secured to each other.

Referring to Figs. 7, 9 and 9-a, I provide an auxiliary member 15 formedof substantially rigid material and overlying the fold 62. The member 15is hinged or scored along its center line 11, so that when pressure isexerted downwardly against the hinge 11 the two edges of the member 15tend to spread apart and, being rigid, tend to spread the fold 62. Sincemember 15 must be substantially rigid in order to function, it must notexceed in length the width of the ultimate cross section of thedistended bag. The sides of the bag when it is fully opened, as in Fig.9-a, move inwardly from the position shown in Fig. '1 as hereinabovedescribed.

It is obvious that the 45 securement illustrated in Figs. '1 and 10 areequally applicable to the bags illustrated in Figs. 1 to 6-a, inclusive,and I have illustrated such securement at 80, 8|, 82 and 83 in Figs. 1and 2a. Such securement assists in defining the bottom folds and,therefore, to a degree contributes to ready opening of bottom (or top)folds, and where a member such as 15 is utilized such securement may beuseful in retaining the member against shifting from the optimumposition. The securement is, however, not indispensable for eitherpurpose and the member 15 may be secured to the top or bottom fold, orboth, by any suitable means such, for example, as the paste spots 15-aand 1li-b, and, since the member 15 contributes far more materially tothe opening characteristics of the top or bottom as herein disclosed,securement within the 45 lines may usually be dispensed with. The use ofsuch a member in the form of Figures 1-4 inclusive is shown at 90 withrespect to the top gusset wall I4 and at 92 with respect to the bottomgusset wall I2 in those figures.

In addition to spreading the lower corners 68 and 10 of the gussetfolds, the member 11 performs an even more important function inbreaking the back of the fold 62. This fold must crumple at each end ofthe hinge 11 as the side edges of the bag approach the ends of member15, and the portions of the fold 62 lying between the side edges of thebag and the extremities of the hinge 11 must be drawn downwardly intothe plane of the folds 68 and 10. In final position this materialoccupies the shaded area A in Fig. 9-a.

The member 15 need not, of course, overlie all of the plies in amulti-ply structure and could be placed at any point between the plies.In such a structure it is also possible to utilize several members, eachof them relatively lighter than the single member and these members maybe placed one after the other between the several plies. It is alsopossible to place the member 15 on the outside of the bag, that is.tucked up into the bottom. In such case it would, of course, have to berather securely fastened to the walls of the bottom and would perhapsoperate with somewhat less efficiency than on the interior of the bag.Exterior application, however, has a distinct advantage from themanufacturing standpoint and I do not intend to be limited to interiorapplication of such member. The term overlying" as usedin the claims,therefore, is intended to include the member in any of the positionsabove noted.

In the subioined claims, unless expressly limited, both single-ply andmulti-ply structures are included in all claims.

What is claimed is:

1. A multi-ply double side seam bag having an infolded gusset at eachend, said side seams being formed by sewing, and a lling opening in oneof said ends, said opening being bounded by a wall of the bag and thewall of one gusset fold the extremities of said opening being spacedfrom said side seams by a distance exceeding the width of said gussetfolds.

2. A multi-ply double side seam bag having an infolded gusset at eachend, said side seams being formed by sewing, a filling opening in one ofsaid ends, said opening being bounded by a wall of the bag and the Wallof one gusset fold and the margins of said bag wall and said gusset;Wall adjacent said opening projecting beyond the opposite bag wall.

3. A multi-ply double side seam bag having an infolded gusset at eachend, said side seams being formed by sewing, a filling opening in one ofsaid ends, said opening being bounded by a wall of the bag and the wallof one gusset fold, the margins of said bag wall and said gusset Walladjacent said opening projecting beyond the opposite bag wall, and oneof said margins projecting farther than the other.

4. A multi-ply side seam bag having an infolded gusset at each end, alling opening in one of said ends, said side seams being formed bysewing, said filling opening lying between sewed seams extendinginwardly from said side seams the extremities of said opening coincidingwith the inner ends of the sewed'seams between which the opening liesand being spaced from said side seams by a distance exceeding the Widthof said gusset folds.

5. A multi-ply double side seam bag having an infolded gusset at eachend, said side seams being formed by sewing, a filling opening in one ofsaid ends, said opening being bounded by a wall of the bag and the Wallof one gusset fold, and lying between sewed seams extending inwardlyfrom said side seams the extremities of said opening coinciding with theinner ends of the sewedseams between which the opening lies and beingspaced from said side seams by a distance exceeding the width of saidgusset folds.

6. A multi-ply double side seam bag having an infolded gusset at eachend, said side seams being formed by sewing, a lling opening in one ofsaid ends, said opening being bounded by a wall of the bag and the wallof one gusset fold and the margins of said bag wall and said gusset walladjacent said opening projecting beyond the opposite bag wall and lyingbetween'sewed seams extending inwardly from said side seams.

7. A multi-ply double side seam bag having an infolded gusset at eachend, said side seams being formed by sewing, a filling opening in one ofsaid ends, said opening being bounded by a wall of the bag and the wallof one gusset fold, the margins of said bag wall and said gusset walladjacent said opening projecting beyond the opposite bag wall, and oneof said margins projecting farther than the other, said lling openinglying between sewed seams extending inwardly from said side seams.

8. A double side seam bag having a gusset fold approximating the widthof the expanded bag body.

9. A double side seam bagvhaving a gusset fold at each end, asubstantially rigid member overlying each gusset fold, each such memberbeing iiexible along its medial line and said line coinciding with theinner fold of each gusset, said members being positioned on said foldmedially with respect to the length thereof and being of a lengthapproximating the width of the expanded bag body.

10. A double side seam bag having a gusset fold at at least one end, asubstantially rigid member overlying said fold, said member beingflexible along its medial line, said line coinciding with the inner foldof said gusset, said member being positioned on said fold medially with`respect to the length thereof and having a length approximating thewidth of the expanded bag body, and means preventing shifting of saidmember relative to said fold.

11. A double side seam bag having a gusset fold at each end, asubstantially rigid member overlying each gusset fold, each such memberbeing flexible along its medial line, said linecoincding with the innerfold of each gusset, said members being positioned on said fold mediallywith respect tothe length thereof and being of a length approximatingthe width of the expanded bag body, and means at each end of said bag toprevent shlifting of each member relative to its respective fo d.

HOWARD A. ROHDIN.

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